EP1063018A1 - Automatische Sprühpistole mit einer Membrane - Google Patents

Automatische Sprühpistole mit einer Membrane Download PDF

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Publication number
EP1063018A1
EP1063018A1 EP00401761A EP00401761A EP1063018A1 EP 1063018 A1 EP1063018 A1 EP 1063018A1 EP 00401761 A EP00401761 A EP 00401761A EP 00401761 A EP00401761 A EP 00401761A EP 1063018 A1 EP1063018 A1 EP 1063018A1
Authority
EP
European Patent Office
Prior art keywords
needle
product
membrane
spraying
pulsed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00401761A
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English (en)
French (fr)
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EP1063018B1 (de
Inventor
Patrick Ballu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Exel Industries SA
Original Assignee
Exel Industries SA
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Filing date
Publication date
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Application filed by Exel Industries SA filed Critical Exel Industries SA
Publication of EP1063018A1 publication Critical patent/EP1063018A1/de
Application granted granted Critical
Publication of EP1063018B1 publication Critical patent/EP1063018B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/08—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators
    • B05B1/083—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators the pulsating mechanism comprising movable parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B05B12/06—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for effecting pulsating flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter

Definitions

  • the invention relates to an automatic diaphragm gun used for spraying of products, in particular spraying of abrasive paints or enamels, water-soluble or dissolved in a solvent.
  • Spray guns in which spraying the product is obtained exclusively hydrostatically, i.e. by applying pressure on the product and take it out through a nozzle at the front end of the gun.
  • Spraying can also be achieved pneumatically, but usually a combination of the two is used, which means that the hydrostatic spraying is combined with compressed air jets which, in addition to a central spray air jet, used to adjust the shape and / or dimensions of the spray of sprayed product.
  • the invention relates more particularly to automatic pistols with membrane in which the membrane is controlled by forced air so that the product, which is fed into the gun under constant pressure, sort of the nozzle by intermittent spraying.
  • the membrane is driven in an oscillating movement by pneumatic control means the pulsed shutter of the product supply comprising a supply of pulsed air which communicates with an annular chamber formed in the body of the pistol around the rod of a control piston which, when actuated by forced air, is moved backwards against the action of an elastic return means.
  • the the piston thus performs a back-and-forth movement at the frequency of the forced air.
  • the front end of the piston rod rests against the diaphragm, in a central zone of the latter, in order to give it an oscillating movement.
  • the product to be sprayed is supplied under pressure in a product receiving chamber which is immediately in front of the membrane and which towards the rear is delimited by this one.
  • This reception room communicates through a central opening with a central product supply channel arranged in the spray head and which opens directly into the nozzle.
  • the central opening is closed by intermittent sealing means constituted by the membrane itself which then is pressed by the end of the piston rod against the peripheral area around the opening which thus forms a seat.
  • intermittent sealing means constituted by the membrane itself which then is pressed by the end of the piston rod against the peripheral area around the opening which thus forms a seat.
  • the diameter of the end of the rod piston is significantly larger than the internal diameter of the opening.
  • this seat is thus at one end of the central channel whose opposite end opens into the nozzle, which means that when the means the forced air control are no longer actuated, i.e. when the spraying is stopped, the entire volume of the central channel constitutes a residue of the product whose flow through the nozzle cannot be prevented, causing soiling.
  • This membrane spray gun also has means pulsed supply of atomizing air near the nozzle spraying to improve spraying and to form the spray of the product.
  • Looks like spray is fed independently of the pulsed output of the product using a programmable controller that feeds the spray air into a room annular formed in the spray head and which communicates with a first set of air openings or nozzles opening close to the nozzle outlet and with a second set of orifices located in a crown placed at the front end of the body gun.
  • This arrangement allows the orifices of this second set of orifices to direct the spray air jets at a much larger angle toward the jet of the product coming out of the nozzle.
  • a general problem that affects both spray guns to membrane than the others that work with a needle valve lies in the fact that some parts are very exposed to wear, especially when the product is a abrasive product such as paint with enamel.
  • the nozzle but also the membrane in the case of spray guns membrane and needle in the case of needle spray guns. All these wearing parts thus require regular replacement which must be done more or less often depending on the abrasive nature of the product. It is therefore desirable to ability to extend the life of these wearing parts and / or facilitate their use replacement.
  • the object of the invention is to remedy all the drawbacks mentioned above by proposing an automatic diaphragm gun which prevents contamination by discharge of a residue of the product when the gun is stopped, which operates without problem at high frequency with frank and immediate response to pulses membrane, which is provided with a simple supply of atomizing air and at least some of the wearing parts of which are designed to allow longer service life and / or easier replacement.
  • the object of the invention is an automatic diaphragm gun for the spraying a product such as paint fed under constant pressure into the gun, comprising means for pulsed spraying of the product comprising an oscillation membrane associated with intermittent sealing means of the supply of the product to a nozzle, and means for controlling said means of pulsed spraying of the product, characterized in that said sealing means have a needle secured to the membrane and passing through it so as to be connected to a pulsation control device.
  • the automatic pistol shown in the drawings is a pistol membrane of the type in which the spraying of the product is obtained by pulsed spraying of the product fed into the gun under constant pressure, in combination with a pulsed supply of atomizing air which, in addition to spraying adjusts the shape and / or dimensions of the product spray sprayed.
  • the process of spraying and adjusting the spray of product sprayed by compressed air jets is well known and, not being part of the invention, it does not will therefore not be described in detail.
  • the gun comprises a body 1 which, preferably, is made of light metal.
  • This body is at its front and rear ends extended by a cylindrical protuberance front 2 and rear protrusion 3 respectively, which are threaded outwardly.
  • the front projection carries a spray head 4 and the rear protuberance carries a cap 5 inside which are housed means control of intermittent output of the product to be sprayed.
  • the product is fed under constant pressure through a pipe 6 in a product supply chamber 7 fitted in the front part of the gun and having a generally frustoconical shape with the smaller diameter end emerging directly into a central channel 8 of the spray head 4 which connects the chamber supplying product 7 to a spray nozzle 9.
  • the means allowing obtaining pulsed spraying of the product have a membrane 10 disposed at the larger diameter end of the frustoconical supply chamber 7.
  • the periphery of the membrane 10 is fixed by clamping between a front part 1 'and a rear part 1 "of the body 1. These two parts 1' and 1" are assembled by screwing and must be separated for the change of the membrane 10 following wear caused by the product on the front of the membrane.
  • the membrane is in a material such as nitrile.
  • the face exposed to this wear is according to the invention coated with a polytetrafluoroethylene (PTFE) layer, which substantially increases the service life of the membrane.
  • PTFE polytetrafluoroethylene
  • the membrane 10 is according to the invention oscillating mounted by means of a needle 11 extending in a through central bore 12 of the second part 1 "of the body 1 and which is connected to control means imparting a back-and-forth movement at this needle.
  • the needle 11 crosses the membrane 10 through a central hole (not shown) thereof and is made integral with the latter by clamping means consisting of flanges 13, 14 integral with the needle and arranged on either side of the membrane 10 so to clamp it between them.
  • the front end of the needle may, as shown in Figure 1, come in support against a seat 15 immediately behind the nozzle in order to constitute together means of intermittently shutting off the supply of the product under pressure into the nozzle.
  • the product passes from the product inlet chamber 7 to the nozzle 9 through a annular spacing defined between the internal wall of the central channel 8 and the external face of the needle.
  • the space behind the membrane 10 in the product inlet chamber is vented through a conduit 16.
  • the needle 11 is guided in a guide sleeve 17 placed inside the central bore 12 and provided with seals 18.
  • the nozzle 9 thus constitutes with the needle 11 and the membrane 10 means of pulsed spraying of the product controlled by control means tires comprising a forced air supply pipe 19 connected to a duct 20 which opens into an annular chamber 21 formed around a piston rod 22 extending into the central bore 12 to be connected to its piston 23 which is guided in the cap 5.
  • the forced air arriving through the pipe 19 is supplied to the annular chamber 21 so as to push the piston 23 against the effect of a return spring 24 bearing on one side against the piston and on the other side against an internal wall of the cap 5.
  • a return spring 24 bearing on one side against the piston and on the other side against an internal wall of the cap 5.
  • Figure 1 shows the advanced position of the needle between two pulses of the control air admitted into the annular chamber 21 through the air duct 20, this position also corresponding to the needle position when the gun is stopped. In the latter case, there is no product leakage through the nozzle 9, since the end of the needle is in abutment against the seat 15 immediately behind the nozzle.
  • the device returns to the position shown in Figure 1 by a displacement of the piston 23 forwards, under the effect of the action of the return spring 24, thereby moving the needle 11 forwards in driving the membrane through the central area of it and this until the needle rests against its seat 15 in order to close the access of the product to the nozzle.
  • the gun is also provided with means for pulsed supply of atomizing air opening near the spray nozzle 9.
  • These spray air supply means have a compressed air hose 25 connected to an air duct 26 opening in a generally circular air inlet chamber 27 arranged around the needle 11 in the rear part 1 "of the body 1 of the pistol.
  • This inlet chamber air 27 is, via another air duct whose opening is indicated in the figures and which extends in the rear and front parts of the body 1, connected to a external circular chamber 29 arranged in the spray head 4.
  • This external chamber 29 is in communication with an internal circular chamber 30 and the two chambers are in a manner known per se connected to the atmosphere by holes opening to the front face of the spray head 4.
  • the orifices 31 of the external chamber 29 are arranged in a ring 32 arranged on the front face of the spray head 4, coaxially with the outlet of the nozzle 9. These orifices 31 form inside the crown 32 air jets directed slightly outwards and converging towards the product jet.
  • the orifices 33 of the internal chamber 30 form near the outlet of the product of the spray nozzle 9 of the air jets directed outwards and divergent to laterally delimit the jet of product.
  • the needle 11 also forms a valve allowing the pulsed supply of air from spray.
  • the needle comprises a valve body 34 constituted by a cylindrical part of larger diameter which at its rear end is connected to the piston rod 22 and which at its front end has a first shoulder beveled 35 intended to cooperate with a second beveled shoulder 36 complementary to the first and arranged inside the central channel 8 immediately in front of the inlet chamber 27 of the compressed air. This second shoulder constitutes a seat for the valve body 34.
  • the valve composed of the first and second shoulders 35, 36 makes function of sealing means preventing the supply of atomizing air towards the spray head 4.
  • valve body 34 leaves the seat 36 to allow free passage of air spray to the spray head. This opening and closing cycle of the valve repeats for each pulse.
  • a second return spring 37 is disposed inside the cap 5 to control the movement of the needle.
  • This second return spring 37 bears on one side on the rear end of the needle and on the other side on the cap 5 to urge the front end of the needle against seat 15 thereof.
  • a membrane spray gun is thus obtained. in which we no longer need a separate controller to manage the air supply spraying and it is possible to apply an operating frequency without problem high with frank and immediate response.
  • the membrane which usually is made of nitrile, can advantageously be coated with a layer of polytetrafluoroethylene, which considerably increases the service life of this part.
  • the end of it is according to the invention consisting of an interchangeable tip which is simply fixed by screwing. For change this nozzle, just remove the spray head to access it. Through elsewhere, to improve the wear resistance of this tip, it can advantageously be made of a synthetic resin suitable for the product to be sprayed.

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  • Nozzles (AREA)
EP00401761A 1999-06-23 2000-06-21 Automatische Sprühpistole mit einer Membrane Expired - Lifetime EP1063018B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9907997A FR2795347B1 (fr) 1999-06-23 1999-06-23 Pistolet automatique a membrane pour la pulverisation d'un produit
FR9907997 1999-06-23

Publications (2)

Publication Number Publication Date
EP1063018A1 true EP1063018A1 (de) 2000-12-27
EP1063018B1 EP1063018B1 (de) 2009-12-09

Family

ID=9547192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00401761A Expired - Lifetime EP1063018B1 (de) 1999-06-23 2000-06-21 Automatische Sprühpistole mit einer Membrane

Country Status (6)

Country Link
US (1) US6378783B1 (de)
EP (1) EP1063018B1 (de)
AT (1) ATE451176T1 (de)
DE (1) DE60043478D1 (de)
ES (1) ES2339633T3 (de)
FR (1) FR2795347B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2903027A1 (fr) * 2006-07-03 2008-01-04 Exel Ind Sa Pistolet automatique de pulverisation
WO2017005354A1 (de) * 2015-07-03 2017-01-12 Dürr Systems Ag Beschichtungsmittelventil
US10870117B2 (en) 2015-07-03 2020-12-22 Dürr Systems Ag Needle valve
WO2022074172A1 (de) * 2020-10-09 2022-04-14 J. Wagner Gmbh Farbdüsenbaugruppe für ein farbspritzgerät

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4437272B2 (ja) * 2002-08-30 2010-03-24 ノードソン株式会社 液体のスプレイ方法
US6997405B2 (en) * 2002-09-23 2006-02-14 Spraying Systems Co. External mix air atomizing spray nozzle assembly
US6874708B2 (en) * 2003-02-13 2005-04-05 Illinois Tool Works Inc. Automatic air-assisted manifold mounted gun
US20080017734A1 (en) * 2006-07-10 2008-01-24 Micheli Paul R System and method of uniform spray coating
DE102008026449A1 (de) * 2008-06-03 2009-12-10 Steur, Anne Karin Vorrichtung und Verfahren zum Impuls-Ausstoß von Medium
DE102018220405A1 (de) * 2017-12-06 2019-06-06 Robert Bosch Gmbh Medienauftragsvorrichtung
CN108906353B (zh) * 2018-07-27 2019-10-29 江苏省中跃涂装设备有限公司 一种用于喷涂机器人的均匀喷涂出料口
CN111515045A (zh) * 2020-05-15 2020-08-11 扬州荣德新能源科技有限公司 一种适用铸造单晶喷涂机器人喷枪安装方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908422A (en) * 1953-12-05 1959-10-13 Reischl & Co K G Atomizers
US4141231A (en) * 1975-07-28 1979-02-27 Maschinenfabrik Peter Zimmer Aktiengesellschaft Machine for applying patterns to a substrate
US4669660A (en) * 1985-01-15 1987-06-02 Kernforschungszentrum Karlsruhe Pulse valve
SU1366226A2 (ru) * 1986-04-17 1988-01-15 Институт газа АН УССР Пневматическа форсунка
FR2674451A1 (fr) * 1991-03-26 1992-10-02 Sames Sa Procede de nettoyage de la partie avant d'un pulverisateur pneumatique de produit de revetement liquide et pulverisateur pneumatique d'un tel produit.
EP0904842A2 (de) * 1997-09-19 1999-03-31 Spraying Systems Co. Luft-Sprühsystem

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142684A (en) * 1975-01-03 1979-03-06 Maschinenfabrik Peter Zimmer Aktiengesellschaft Pulse generator for intermittently energizing an actuating coil of a spray nozzle or the like
US5398873A (en) * 1994-04-28 1995-03-21 Johnson; Lonnie G. Fluid pulsator with accumulator for frequency control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908422A (en) * 1953-12-05 1959-10-13 Reischl & Co K G Atomizers
US4141231A (en) * 1975-07-28 1979-02-27 Maschinenfabrik Peter Zimmer Aktiengesellschaft Machine for applying patterns to a substrate
US4669660A (en) * 1985-01-15 1987-06-02 Kernforschungszentrum Karlsruhe Pulse valve
SU1366226A2 (ru) * 1986-04-17 1988-01-15 Институт газа АН УССР Пневматическа форсунка
FR2674451A1 (fr) * 1991-03-26 1992-10-02 Sames Sa Procede de nettoyage de la partie avant d'un pulverisateur pneumatique de produit de revetement liquide et pulverisateur pneumatique d'un tel produit.
EP0904842A2 (de) * 1997-09-19 1999-03-31 Spraying Systems Co. Luft-Sprühsystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section PQ Week 8830, 30 June 1988 Derwent World Patents Index; Class P42, AN 88-212244, XP002132626 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2903027A1 (fr) * 2006-07-03 2008-01-04 Exel Ind Sa Pistolet automatique de pulverisation
WO2008003850A1 (fr) * 2006-07-03 2008-01-10 Exel Industries Pistolet automatique de pulverisation
US8205807B2 (en) 2006-07-03 2012-06-26 Exel Industries Automatic atomizing spray gun
WO2017005354A1 (de) * 2015-07-03 2017-01-12 Dürr Systems Ag Beschichtungsmittelventil
CN107847884A (zh) * 2015-07-03 2018-03-27 杜尔系统股份公司 涂覆剂阀
US10668491B2 (en) 2015-07-03 2020-06-02 Dürr Systems Ag Coating agent valve
US10870117B2 (en) 2015-07-03 2020-12-22 Dürr Systems Ag Needle valve
CN107847884B (zh) * 2015-07-03 2021-06-11 杜尔系统股份公司 涂覆剂阀
WO2022074172A1 (de) * 2020-10-09 2022-04-14 J. Wagner Gmbh Farbdüsenbaugruppe für ein farbspritzgerät

Also Published As

Publication number Publication date
ATE451176T1 (de) 2009-12-15
FR2795347B1 (fr) 2001-08-03
DE60043478D1 (de) 2010-01-21
EP1063018B1 (de) 2009-12-09
FR2795347A1 (fr) 2000-12-29
ES2339633T3 (es) 2010-05-24
US6378783B1 (en) 2002-04-30

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